Gibberellin-deficient dwarfs in potato vary in exogenous GA3 response when thega 1 allele is in different genetic backgrounds
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- 作者：Sandra E. Vega (1)
John B. Bamberg (2)
Jiwan P. Palta (1) - 关键词：Solanum tuberosum ssp.andigena ; gibberellin ; bioassay ; in vitro ; GA ; GA mutant ; response
- 刊名：American Journal of Potato Research
- 出版年：2006
- 出版时间：September 2006
- 年：2006
- 卷：83
- 期：5
- 页码：357-363
- 全文大小：1068KB
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John B. Bamberg (2)
Jiwan P. Palta (1)
1. Department of Horticulture, University of Wisconsin, 1575 Linden Drive, 53706, Madison, WI, USA
2. USDA/Agricultural Research Service, US Potato Genebank, 4312 Hwy 42, 54235, Sturgeon Bay, WI, USA
文摘
Gibberellins (GAs) are involved in internode elongation and other important processes such as seed germination, flowering, maturation, tuberization, and tuber dormancy. The discovery of GA-deficient mutants enabled further study of the role of these hormones in many plant processes. GA-deficient mutants lack the ability to produce adequate amounts of gibberellin for normal growth, resulting in a rosette type growth and short internodes. Thega 1 mutant allele was introduced into various genetic backgrounds including differentSolanum species and ploidies. Diploid GA-deficient genotypes were obtained by crossing haploidSolanum tuberosum ssp.andigena withSolanum chacoense. The progeny was then bulked and intermated to produce F2 individuals. Tetraploid GA-deficient genotypes were obtained by crossingS. tuberosum ssp.andigena withSolanum sucrense and withSolanum gourlayi. The two resulting progenies were then bulked and intermated. Diploid and tetraploid GA-deficient genotypes were grown on MS media containing different levels of gibberellin (GA3). Plant height and visual observations were made as a way to assess the response of these genotypes to GA3. Concentration of 0.1 μM GA3 and lower failed to restore normal plant height in both diploid and tetraploid genotypes. Normal plant height was restored in most of the GA-deficient genotypes when concentrations between 0.8 and 1.2 μM GA3 were used. We found some important differences between these genotypes: (1) the level of GA3 to restore normal plant height varies among the GA-deficient genotypes, some needed more GA3 than others to grow normally; (2) the time to respond to the presence of GA3 in the media differs between the GA-deficient genotypes, (3) tetraploid genotypes exhibited normal growth and internode length in response to GA3, while diploid genotypes tended to show a rosette-type growth at the apical end. These results suggest thatga 1 mutants can be affected by a series of modifier genes and/or iso-alleles. The importance of variable response to GA among dwarf individuals is two fold: (1) experiments measuring GA response should choose and clonally multiply one genotype to ensure uniform optimal response to GA application; and (2) variation betweenga 1 mutant phenotypes could be used to characterize GA-response modifier genes.